关键词: 缸体类零件, 加工特征识别, 属性邻接图, 复合加工特征

Abstract: Aiming at the machining feature recognition problem of engine cylinder blocks,a hybrid machining feature recognition method based on graph decomposition and feature factors cluster was proposed.The machining surfaces were obtained from 3D models in STEP AP203 format,and the extended attributed adjacency graph was constructed.The extended attributed adjacency graph was decomposed into the minimum attributed adjacency graphs which could be matched with predefined feature elements to obtain the characteristic factors.To meet the machining requirements,the feature factors were clustered based on machining rules and the composite machining feature were obtained.A case study was carried out to demonstrate the feasibility and effectiveness of the proposed method.The experimental results illustrated that the method could effectively solve some problems of intersecting features recognition and NP-hard feature explanation for cylinder blocks.

Key words: cylinder block, machining feature recognition, attributed adjacency graph, composite machining feature